Chair.



I Patented Dec. I2, |899. H. W. BDLENS.

CHAIR No. 639,0l2.

(Application med'xuly 17, 1899.)

l (No Model.)

wmildw E lTBD STATES aunar FFlCE@ CHAIR.

SPECIFICATION forming part of Letters Patent No. 639,012, dated December 12, 1899.

Application led J'uly 17, 189 9.

T0 cir/ZZ whom it 'may concern.-

Be it known that I, HARRY W. BoLnNs, a citizen of the United States, and a resident of Port Washington, in the county of Ozaukee and State of Wisconsin, have invented certain newand useful Improvements in Chairs; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to chairs such asembody vertically-adj ustable seat-supports in their organization; and Vit consists in certain peculiarities of construction and combination of parts hereinafter particularly described with reference to the accompanying drawings and subsequently claimed, whereby the adj ustment of said seat-supports is facilitated.

Figure l of the drawings illustrates an improved construction and arrangement of parts constituting one form of my invention, certain of said parts being shown broken and in section, this View being indicated by line l l in the third figure. Figs. 2 and 3 of said drawings represent plan views, partly in horizontal section, these views being respectively indicated by lines 2 2 and 3 3 in the first gure; and Fig. 4, a detail view of a movable spline.

Referring by letter to the drawings, A represents asinooth-bore chair-base casting, and B a cylindrical nut that extends down through said casting. The upper end of the nut is provided with an exterior annular fiange Z), and the chair-base casting is counterbored to accommodate said fiange. Detachably secured on the lower end of the nut by setscrews or otherwise is a hand-wheel C, and this hand-wheel prevents said nut and parts Vin connection therewith from being lifted out of the chair-base casting. Engaging the nut is a longitudinally-grooved screw-spindle D, and a correspondingly-tapped collar E has engagement with the spindle above the nut. The collar encircles a spline F, loose in the longitudinal groove o of screw-spindle D, and right-angled extremities of this spline constitute a head cl and foot e in opposition to the upper and lower edges of said collar.

The flanged end ot' the nut B is provided with radial notches f, any one of which may be engaged by the foot e ot spline F, whereby a union is had of said nut, the spindle D, and

collar E, so that all three of these parts may sefinnmzaoso. (remodel.)

turn together without disturbing the vertical adjustment of said spindle to which the seatframe spider G of the chair is rigidly secured.

To vary elevation of the spindle D, the collar E is run up on the same to lift the spline F clear ot' n ut B as far as may be necessary, after which said nut is operated, by means of its hand-wheel C, to raise or lower said spindle.` The adjustment having been eifected, the collar E is run down and the foot e of spline F again engaged with a radial notch f of the lianged end of nut B, where it is held fast by a further running down of said collar, it being possible to perform all of saidl operations With one hand, the length of said spline being sucient, as herein shown, to permita necessary amount of loose vertical play in spindle D at times independent of the aforesaid collar.

From the foregoing it will be understood that" the seat and base portions of a chair embodying my improvements may be readily separated for knockdown shipment and storage.

While l have shown and described a simple economical construction and arrangement of parts constituting my invention organized to provide for operating the spindleadjusting nut from underneath the chair-base casting, the organization may be otherwise and yet include the loose spline and screwcollar aforesaid in practically the same relation to each other and said nut as is herein particularly set forth.

Having thus described my invention, what I claim as new, and desire to secureby Letters Patent, is-M 1. A chair-base casting, an indented nut supported by the casting, a longitudinallygrooved screw-spindle engaging the nut, a headed spline loose in the spindle-groove for engagement with the indented nut, and a screw-collar on the spindle in opposition to the head of the spline, provision being had for loose vertical play of said spline independent of the collar.

2. A chair-base casting, a nut supported by the casting and having one of its ends radially notched, alongitudinallygrooved screwspindle engaging the nut, a spline loose in the spindle-groove and having right-angled eX- tremities one of which is engageable with a IOO nut-notch, and a sei'eW-collaion said spindle the head of the spline, provision being had between extremities of the spline, the latter for loose Vertical play of said spline indehavinglimited Vertical adjustment independ- I pendent of the Collar.

ent of the collar.

3. A chair-base casting having a countersuuk smooth bore, a cylindrical nut that engages the bore of the casting and is flanged at its upper end to rest in the oountersinkof said b01e,alongitudinally-grooved screw-spindle engaging the nut, a nut-engaging headed spline loose in the spindle groove, and a sorew-eollar on the spindle in opposition to In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of Tisconsin, in the presence of Itwo witnesses.

HARRY W. BOLENS.

Witnesses:

. N. E. OLIPHANT,

B. C. RoLoFF. 

